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https://issues.apache.org/jira/browse/ARROW-10580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17233123#comment-17233123
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Wes McKinney commented on ARROW-10580:
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Possibly allowing non-increasing offsets in the columnar spec
> [C++] When Validating, ensure DenseUnionArray offsets are increasing
> --------------------------------------------------------------------
>
> Key: ARROW-10580
> URL: https://issues.apache.org/jira/browse/ARROW-10580
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Affects Versions: 2.0.0
> Reporter: Ben Kietzman
> Assignee: Antoine Pitrou
> Priority: Major
> Fix For: 3.0.0
>
>
> https://github.com/apache/arrow/pull/8652#discussion_r522332386
> The format documentation states that "The respective offsets for each child
> value array must be in order / increasing."
> https://arrow.apache.org/docs/format/Columnar.html#dense-union
> However this is not currently checked in {{Array::ValidateFull}}
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